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    SubjectRe: DMA conflicts with soundcard for ide driver via82cxxx
    In my BIOS-setup there is an option "PCI latency" which defaults to
    32. First I changed it to 128. That worked perfect. Later I have decreased
    it to 64, 48 and 40. But 40 still gave some problems (a little bit
    distortion of my sound). After that I tried 44, but the disk was to slow
    with this setting (30 MB/s instead of 40 MB/s). So now I have a PCI
    latency of 48. The strange thing is that it seems not to work
    directly. After the system boot when I do hdparm -t, I get about 5
    MB/s. But then when I switch using_dma off and on again using hdparm, I
    get the full 40 MB/s and no distortion of my es1371. Any ideas what might
    cause this?

    Regards,

    Edward




    ---------- Forwarded message ----------
    Date: Tue, 1 Jan 2002 18:14:41 +0100
    From: Vojtech Pavlik <vojtech@suse.cz>
    To: Edward Stempel <eazstempel@cal009001.student.utwente.nl>
    Cc: linux-kernel mailinglist <linux-kernel@vger.kernel.org>
    Subject: Re: DMA conflicts with soundcard for ide driver via82cxxx

    On Fri, Dec 28, 2001 at 05:10:43PM +0100, Edward Stempel wrote:

    > Excellent! That solved my problem.

    What exactly did you have to change? It might be worth to include the
    changing of the latency setting in the kernel.

    >
    > Thankx
    >
    > Edward
    >
    >
    >
    >
    > Date: Fri, 28 Dec 2001 10:15:05 +0100
    > From: Vojtech Pavlik <vojtech@suse.cz>
    > To: Edward Stempel <eazstempel@cal009001.student.utwente.nl>
    > Cc: linux-kernel mailinglist <linux-kernel@vger.kernel.org>
    > Subject: Re: DMA conflicts with soundcard for ide driver via82cxxx
    >
    > On Fri, Dec 28, 2001 at 03:32:34AM +0100, Edward Stempel wrote:
    >
    > > I have an Asus a7v266 mother board and an Ensoniq sound card in it.
    > > The ide chipset is a VIA VT8233 that is capable of UDMA100. So I built a
    > > kernel with the es1371 sound driver and the via82cxxx ide driver
    > > configured in it. Actually I tried the kernel 2.4.17 first, and the latest
    > > I tried is 4.5.1 with the latest patch (patch-2.5.2-pre3) applied to it.
    > > I also tried the kernel 2.5.1 with Vojtech patch (via-3.33.diff from
    > > his email dated 2001-12-23 23:20:48) applied to it, with the same
    > > (negative) results.
    > >
    > > The good thing is that hdparm reports appr. 40 MB/sec when using DMA and
    > > about 6 MB/sec when not using DMA.
    > > Unfortunately using DMA for ide results in some ugly distortion of the
    > > sound from my soundcard whenever some IO to the disk is done. :((
    > >
    > > I have assigned different interrupts to the PCI-cards (ide is
    > > on-board) and I even changed the sound card's PCI slot, so it shared
    > > its interrupt with another device (acpi instead of USB). It did not solve
    > > the problem. Because the problem only occurs when switching on using_dma
    > > on the ide driver, I think it is a DMA problem with the ide driver. It may
    > > be the es1371 driver as well off course, but I suspect it is the ide
    > > driver (or chipset).
    > >
    > > Reading the list archive from linux-kernel, I discovered there have been
    > > more problems with DMA using this chipset, but I did not find anyone
    > > having the same problem as I have now.
    > >
    > > Has someone also dealt with these problems, or can someone help me
    > > solving this problem? Please help!
    > >
    > > Below are some outputs using kernel 5.1 with patch-2.5.2-pre3.
    >
    > You may try changing the PCI latency settings on either the IDE
    > controller or the sound card. Other than that, I don't know how to help.
    >
    > --
    > Vojtech Pavlik
    > SuSE Labs

    --
    Vojtech Pavlik
    SuSE Labs

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